To design a reasonable packing material, solve the problem of solid pollution brought by the iron ore mining, alleviate a lot of backfilling affect national economic development and the current situation of environmental governance. Backfilling materials in this paper, we study the different water-cement ratio pack slump and uniaxial compressive strength and discusses the workability of water-cement ratio on filling body and the influence of uniaxial compressive strength. The experimental results show that with the increase of water cement ratio, the filling body's workability is better and uniaxial compressive strength is lower. When water cement ratio is 0.4, workability and strength of filling body is the best. The experiment provide reliable data for engineering application practice, at the same time to provide reference for other related experiment.

Based on the engineering practice of the large section roadway in Zhaozhuang Mine, which has composite roof of mudstone and sandy mudstone, and the shale floor, and did the support optimization design of large section roadway through three-dimensional numerical simulation by using the FLAC3D. To optimize the row spacing between the bolt, it carried out nine group test of numerical simulation program to analyze, six group test of numerical simulation program to analyze the length of the anchor cable, and five group test to analyze the distance of the anchor cable. Through these, the effect of the bolt spacing, the length of the top anchor cable, the anchor cable spacing and other support parameters to the supporting are got, and putting forward an anchor - anchor cable integrated supporting parameters optimization program to match the large section of the composite roof. Results show that it is reasonable to use 950mm x 900mm of the bolt spacing in design, and 7.5 meters length in design the top anchor cable.

when explosive blasts in the rock, the stress wave of impact produced appears all kinds of phenomena, such as reflection, refraction, and transmission in the process of transmission on the joint surface because of discontinuity, heterogeneity and anisotropy of rock mass of weak plane in physics, which lead to extremely complex on rock blasting process. Through conducting on high dynamic strain test of blasting process on joint rock mass model, it researches dynamic load characteristics of joint rock mass and joint-planes effect on extension of critical raw crack and attenuation law of stress wave, analyzes the strain waveform of strain gages which locate in the different direction between initial crack of blasting and joint, and figures out the impact of joint plane on the stress wave transmission, which provide an important theoretical basis on the relevant parameters design in the process of blasting engineering of joint mass existing in actual.